Light Years to km
A light year is how far light travels in a vacuum in one year — about 9.461 trillion kilometres. Proxima Centauri, the nearest star, sits 4.2 light years away.
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Common values
Formula
km = light years × 9460730472580.8
A light year measures distance, not time. Saying something happens “a few light years from now” is simply wrong.
Frequently asked questions
Q. How many km is 1 light years?
1 light years is 9460730472580.8 km, and 10 light years is 94607304725808 km. Type any value in the box above to convert instantly.
Q. And how many light years is 1 km?
1 km is 0 light years. This converter works both ways, so typing in the right box updates the left one.
Q. Where is this unit used?
A light year measures distance, not time. Saying something happens “a few light years from now” is simply wrong.
Other converters
Traditional units (geun, doe, majigi and so on) vary by region and product.